Emerson Copeland Scroll YHV 2P Series - Low Discharge Pressure; Low Suction Pressure; Noise During Shut-off

AGL_HP_VS_YHV2P_E_Rev0 37
Condition
Cause
Corrective action
Low discharge
pressure
Low ambient
temperature
Fit a fan cycling control system.
Refrigerant
undercharge
Check the system for leaks. Observe sight glass for
bubbles. Add refrigerant until the sight glass is clear.
Low suction
pressure
System design
load too small
If the compressor is running in a tandem or in parallel,
modulate the running process.
Inadequate
refrigerant
going to the
evaporator
Lower normal discharge pressure values can lead to
insufficient refrigerant flow to the system.
This can also be verified by checking the evaporator
outlet superheat, if it is found unusually high. Check the
selection of the expansion valve (likely undersized).
Noise during shut-
off
Anti-reverse
device
This does not have any effect on the durability of the
compressor, no action is necessary.
8 Dismantling & disposal
Removing oil and refrigerant:
▪ Do not disperse in the environment.
▪ Use the correct equipment and method of removal.
▪ Dispose of oil and refrigerant in accordance with national legislation and
regulations.
Dispose of compressor and drive in accordance with national legislation and
regulations.
9 Reference list of related technical information
Please visit www.climate.emerson.com/en-gb for free download of Application Guidelines
and Technical Information.
Additional technical information:
▪ C30.11/0419/E “NTC Mounting Recommendations”
▪ ED3 User Manual (June 2019 version)
Performance and technical data:
The latest version of Copeland brand products Select software with performance data and technical
data is available from the webpage www.climate.emerson.com/en-gb.
Spare parts and accessories:
Join the webpage www.climate.emerson.com/en-gb under tools & resources for an online version
of the Emerson spare parts and accessories software.
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described herein or their use or applicability.
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